This book was recommended to me by a fellow river-runner, and I read it because I am interested in rafting/kayaking the Grand Canyon. In fact, the book does much more than give the reader an idea of what to expect on a river-running trip. Intermixed with the author's own experiences of running the Canyon is a wealth of history, geology, natural history, conservation, and socio-politics. As veteran river guide, Ghiglieri can certainly tell a good story, and maintains quite a repertoire of them—this much I expected. The pleasant surprise was how much I learned from this thoughtful science professor about the parts of the canyon lying above and beyond the water's edge, which are, indeed, far greater than the river itself. I'm hooked!